Myopic crescent

Myopic crescent

A myopic crescent is a moon-shaped feature that can develop at the temporal border of disc (it rarely occurs at the nasal border) of myopic eyes. It is primarily caused by atrophic changes that are genetically determined, with a minor contribution from stretching due to elongation of eyeball. In myopia that is no longer progressing, the crescent may be asymptomatic except for its presence on ocular examination. However, in high-degree myopia, it may extend to the upper and lower borders, or form a complete ring around the optic disc and form a central scotoma.

The myopic crescent is commonly seen in pathological axial myopia. The condition sometimes described erroneously as myopic choroiditis, but myopic crescant is not an inflammatory process and does not run parallel to the degree of myopia. It usually tends to occur after mid adult life. Myopic crescent is often associated with some degree of retinal degeneration and occasionally vitreous degeneration.

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  • conus — 1. [TA] SYN: cone. 2. Posterior staphyloma in myopic choroidopathy. [L. fr. G. konos, cone] c. arteriosus [TA] the left or anterosuperior, smooth walled portion of the cavity of the right ventricle of the …   Medical dictionary

  • creciente miópico — Eng. Myopic crescent Área de atrofia de coroides y epitelio pigmentario de la retina en la porción temporal del disco óptico que permite la visualización de la esclera, principalmente en la miopía patológica aunque también en la miopía simple.… …   Diccionario de oftalmología

  • degeneration — 1. Deterioration; passing from a higher to a lower level or type. 2. A worsening of mental, physical, or moral qualities. 3. A retrogressive pathologic change in cells or tissues, in consequence of which their functions are often impaired or… …   Medical dictionary

  • creciente miópico escleral — Eng. Myopic scleral crescent Ver creciente miópico …   Diccionario de oftalmología

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